CN107678998B - A kind of external serial server of toggle switch - Google Patents
A kind of external serial server of toggle switch Download PDFInfo
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- CN107678998B CN107678998B CN201710949217.0A CN201710949217A CN107678998B CN 107678998 B CN107678998 B CN 107678998B CN 201710949217 A CN201710949217 A CN 201710949217A CN 107678998 B CN107678998 B CN 107678998B
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- resistance
- voltage stabilizing
- toggle switch
- directional voltage
- stabilizing diode
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of external serial servers of toggle switch, including toggle switch and control chip, and being realized by way of external dial switch can set outside pull-up, pull down resistor and the terminal coupling resistance of RS485 signal wire AB.Whether scene pull down resistor and can put into terminal coupling resistance by changing the state of toggle switch, in selection when using.The change of toggle switch, changes the circuit dynamic parameter of bus, so that 485 signals on circuit be made to meet field demand；The present invention provides 1K ohm and 10K ohm of upper pull down resistor and 120 ohm of terminal coupling resistance.Terminal coupling resistance can change load impedance characteristic with 485 serial ports link load parallel connections, and the upper pull down resistor of two pairs of different resistance values can change pull down resistor to match the load of 485 link serial ports.
Description
Technical field
The present invention relates to serial server technical field, specially a kind of external serial server of toggle switch.
Background technique
Application is mainly with 485 bus mode wiring to RS485 serial equipment at the scene.Bus length, the mode of connection, serial ports
Device type, the factors such as live electromagnetic environment, which all may cause, there is communications errors height, and driving capability is insufficient.Current solution party
Case mainly reduces traffic rate, or external increase repeater.Existing technical solution is fixed inside serial equipment
Pull down resistor, fixed terminal build-out resistor can not live flexible choice.It can scene spirit using the serial equipment of external dial switch
Configuration living changes upper pull down resistor mode by toggle switch and changes the suitable field adjustable environment of driving capability mode.Practical effect
Fruit is obvious.
Summary of the invention
The purpose of the present invention is to provide a kind of external serial servers of toggle switch, to solve to mention in above-mentioned background technique
Out the problem of.
To achieve the above object, the invention provides the following technical scheme: a kind of external serial server of toggle switch, including
Toggle switch and control chip, one foot of toggle switch and two feet are all connected with the end VCC, and three feet and four feet are grounded；Six feet connect
The one end connecting resistance C, seven feet connect the one end resistance D, and octal connects the one end resistance E, and nine feet connect the one end resistance F, ten feet connection electricity
The one end G is hindered, the resistance C other end connects the resistance D other end and connects the one end resistance H and the control end chip A；The resistance E is another
One end connects the resistance F other end and connects the one end resistance I and the control end chip B, the resistance G other end connection control end chip B；
Another end termination VCC resistance H, resistance I other end ground connection, five foot of the toggle switch connection control end chip A；
The control end chip DE and the end RE are separately connected the one end resistance A, and the control end chip R connects the one end resistance B,
The resistance A other end and the resistance B other end connect the end VCC, the control end the chip GND ground connection, and the end VCC and the end GND are indirectly
Enter capacitor；
It further include bi-directional voltage stabilizing diode A, bi-directional voltage stabilizing diode B, bi-directional voltage stabilizing diode C, thermistor A, temperature-sensitive
Resistance B, described one end bi-directional voltage stabilizing diode A are separately connected the one end bi-directional voltage stabilizing diode 2b, the one end thermistor A and control
The end chip B；Another termination RS485 signal end of thermistor A；The bi-directional voltage stabilizing diode B other end is separately connected double
To the one end zener diode C, the one end thermistor B and the control end chip A；The bi-directional voltage stabilizing diode A other end and two-way
The zener diode C other end is grounded；The thermistor B other end connects RS485 signal end.
Preferably, the resistance D and resistance F is pull-up resistor, and resistance value is 1K ohm；The resistance C and electricity
Hindering E is pull down resistor, and resistance value is 10K ohm.
Preferably, the resistance G is terminal coupling resistance, and resistance value is 120 ohm.
Preferably, the bi-directional voltage stabilizing diode A, bi-directional voltage stabilizing diode B, bi-directional voltage stabilizing diode c-type number are all made of
SMBJ6.8CA。
Compared with prior art, the beneficial effects of the present invention are: the present invention is realized by way of external dial switch
Pull-up, pull down resistor and the terminal coupling resistance outside of RS485 signal wire AB can be set.Scene can be opened when using by changing dial-up
Whether the state of pass pull down resistor and puts into terminal coupling resistance in selection.The change of toggle switch changes the circuit of bus
Dynamic parameter, so that 485 signals on circuit be made to meet field demand；The present invention provides above and below 1K ohm and 10K ohm
Pull-up resistor and 120 ohm of terminal coupling resistance.Terminal coupling resistance can change load impedance with 485 serial ports link load parallel connections
Characteristic, the upper pull down resistor of two pairs of different resistance values can change pull down resistor to match the load of 485 link serial ports.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of external serial server of toggle switch, including dial-up
Switch 1 and control chip 2,1 one foot of toggle switch and two feet are all connected with the end VCC, and three feet and four feet are grounded；The connection of six feet
The one end resistance C3a, seven feet connect the one end resistance D4a, and octal connects the one end resistance E5a, and nine feet connect the one end resistance F6a, ten feet
The one end resistance G7a is connected, the resistance C3a other end connects the resistance D4a other end and connects the one end resistance H8a and control chip 2A
End；The resistance E5a other end connects the resistance F6a other end and connects the one end resistance I9a and the control end chip 2B, resistance
The G7a other end connection control end chip 2B；Another end termination VCC resistance H8a, resistance I9a other end ground connection, the dial-up
1 five foot of the switch connection control end chip 2A；
The control end chip 2DE and the end RE are separately connected the one end resistance A1a, and the control end chip 2R connects resistance
The one end B2a, the resistance A1a other end and the resistance B2a other end connect the end VCC, the control end the chip 2GND ground connection, and the end VCC
Capacitor 3 is accessed between the end GND；
It further include bi-directional voltage stabilizing diode A1b, bi-directional voltage stabilizing diode B2b, bi-directional voltage stabilizing diode C3b, thermistor
A1c, thermistor B2c, bi-directional voltage stabilizing diode A1b, bi-directional voltage stabilizing diode B2b, bi-directional voltage stabilizing diode C3b model are adopted
Use SMBJ6.8CA；Described one end bi-directional voltage stabilizing diode A1b is separately connected the one end bi-directional voltage stabilizing diode B2b, thermistor
The one end A1c and the control end chip 2B；Another termination RS485 signal end of thermistor A1c；The bi-directional voltage stabilizing diode
The B2b other end is separately connected the one end bi-directional voltage stabilizing diode C3b, the one end thermistor B2c and the control end chip 2A；It is described two-way
The zener diode A1b other end and the bi-directional voltage stabilizing diode C3b other end are grounded；The thermistor B2c other end connection
RS485 signal end.
Wherein, resistance D4a and resistance F6a is pull-up resistor, and resistance value is 1K ohm；The resistance C3a and electricity
Hindering E5a is pull down resistor, and resistance value is 10K ohm；Resistance G7a is terminal coupling resistance, and resistance value is 120 Europe
Nurse.The present invention provides 1K ohm and 10K ohm of upper pull down resistor and 120 ohm of terminal coupling resistance.Terminal coupling electricity
Resistance can change load impedance characteristic with 485 serial ports link load parallel connections, and the upper pull down resistor of two pairs of different resistance values can change
Pull down resistor loads to match 485 link serial ports.
The present invention realizes pull-up, pull down resistor and the terminal of RS485 signal wire AB by way of external dial switch
It can be set with resistance outside.Whether scene pull down resistor and can put into end by changing the state of toggle switch, in selection when using
Hold build-out resistor.The change of toggle switch, changes the circuit dynamic parameter of bus, so that 485 signals on circuit be made to meet
Field demand.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of external serial server of toggle switch, including toggle switch (1) and control chip (2), it is characterised in that: described
(1) one foot of toggle switch and two feet are all connected with the end VCC, and three feet and four feet are grounded；Six feet connect the one end resistance C (3a), seven feet
The one end resistance D (4a) is connected, octal connects the one end resistance E (5a), and nine feet connect the one end resistance F (6a), and ten feet connect resistance G
The one end (7a), resistance C (3a) other end connect resistance D (4a) other end and connect the one end (8a) resistance H and control chip (2)
The end A；Resistance E (5a) other end connects resistance F (6a) other end and connects the one end (9a) resistance I and control chip (2) B
End, resistance G (7a) other end connection control chip (2) end B；Another end termination VCC of resistance H (8a), resistance I (9a) are another
End ground connection, described (1) five foot of toggle switch connection control chip (2) end A；
Control chip (2) end DE and the end RE are separately connected the one end resistance A (1a), and control chip (2) end R connects resistance
The one end B (2a), resistance A (1a) other end and resistance B (2a) other end connect the end VCC, and control chip (2) end GND is grounded,
And capacitor (3) are accessed between the end VCC and the end GND；
It further include bi-directional voltage stabilizing diode A (1b), bi-directional voltage stabilizing diode B (2b), bi-directional voltage stabilizing diode C (3b), temperature-sensitive electricity
A (1c), thermistor B (2c) are hindered, described bi-directional voltage stabilizing diode A (1b) one end is separately connected bi-directional voltage stabilizing diode B (2b)
One end, the one end (1c) thermistor A and control chip (2) end B；Another termination RS485 signal end of thermistor A (1c)；
Bi-directional voltage stabilizing diode B (2b) other end is separately connected the one end bi-directional voltage stabilizing diode C (3b), thermistor B (2c) one
End and control chip (2) end A；Bi-directional voltage stabilizing diode A (1b) other end and bi-directional voltage stabilizing diode C (3b) other end are equal
Ground connection；Thermistor B (2c) other end connects RS485 signal end.
2. the external serial server of a kind of toggle switch according to claim 1, it is characterised in that: the resistance D (4a)
It is pull-up resistor with resistance F (6a), resistance value is 1K ohm；The resistance C (3a) and resistance E (5a) are drop-down electricity
Resistance, resistance value is 10K ohm.
3. the external serial server of a kind of toggle switch according to claim 1, it is characterised in that: the resistance G (7a)
For terminal coupling resistance, resistance value is 120 ohm.
4. the external serial server of a kind of toggle switch according to claim 1, it is characterised in that: the bi-directional voltage stabilizing two
Pole pipe A (1b), bi-directional voltage stabilizing diode B (2b), bi-directional voltage stabilizing diode C (3b) model are all made of SMBJ6.8CA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710949217.0A CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710949217.0A CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107678998A CN107678998A (en) | 2018-02-09 |
| CN107678998B true CN107678998B (en) | 2019-10-15 |
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| CN201710949217.0A Active CN107678998B (en) | 2017-10-12 | 2017-10-12 | A kind of external serial server of toggle switch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2629145Y (en) * | 2003-01-20 | 2004-07-28 | 北京安控科技发展有限公司 | RS-232 /RS-485 semi-duplex signal switching circuit |
| CN201514214U (en) * | 2009-09-23 | 2010-06-23 | 北京华电通达科技有限公司 | Portable video repairing instrument |
| CN202205048U (en) * | 2011-08-22 | 2012-04-25 | 株洲科瑞变流电气有限公司 | Communication controller |
| CN204360374U (en) * | 2015-01-07 | 2015-05-27 | 山东鲁能智能技术有限公司 | A kind of RS232/RS485 is two switches transformer station's integrated power supply supervising device |
| CN104734780A (en) * | 2014-12-29 | 2015-06-24 | 东莞市启鼎光电科技有限公司 | Passive light-splitting RS-485 optical fiber bus local side system |
-
2017
- 2017-10-12 CN CN201710949217.0A patent/CN107678998B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2629145Y (en) * | 2003-01-20 | 2004-07-28 | 北京安控科技发展有限公司 | RS-232 /RS-485 semi-duplex signal switching circuit |
| CN201514214U (en) * | 2009-09-23 | 2010-06-23 | 北京华电通达科技有限公司 | Portable video repairing instrument |
| CN202205048U (en) * | 2011-08-22 | 2012-04-25 | 株洲科瑞变流电气有限公司 | Communication controller |
| CN104734780A (en) * | 2014-12-29 | 2015-06-24 | 东莞市启鼎光电科技有限公司 | Passive light-splitting RS-485 optical fiber bus local side system |
| CN204360374U (en) * | 2015-01-07 | 2015-05-27 | 山东鲁能智能技术有限公司 | A kind of RS232/RS485 is two switches transformer station's integrated power supply supervising device |
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| Publication number | Publication date |
|---|---|
| CN107678998A (en) | 2018-02-09 |
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